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Sir David Richard Llewellyn, first baronet (1879–1940), coal owner and financier
1879 Born at Aberdare son of Alderman Rees Llewellyn and his wife, Elizabeth. Rees Llewellyn was a renowned mining engineer, who had successfully reorganized the Bwllfa colliery.
Together with two other sons Rees later joined forces with David in a number of coal ventures.
1900 Enrolled in a course for mining engineers at University College, Cardiff
1903-5 Studied mechanical mining in USA
1905 Started the Windber colliery, aiming to work its thin seams with electrically driven cutters.
1914-16 Acquired four additional collieries, all drift mines, around Aberdare.
Especially between 1916 and the early 1920s, he was involved in a frenzy of mergers and acquisitions of coal mines.
1920 Registered his company D. R. Llewellyn and Sons Ltd to hold the coal mine interests.